[Issue 10824] Unsupported regexp(?>) error during run time

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10824


Dmitry Olshansky <dmitry.olsh at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |INVALID


--- Comment #1 from Dmitry Olshansky <dmitry.olsh at gmail.com> 2013-08-15 11:41:33 PDT ---
(In reply to comment #0)
> void main(string argv[]) {
> auto myRegex = regex(`(?>test)`, "i");
> }
> 
> Compiles but throws the following run time error.  I think this should be
> handled during compile time.

It can't as auto myRegex is a run-time varaible and the expression on the right
may as well depend on external variables. See e.g. 

auto myRegex = regex(argv[1], "i");

How would that be handled at compile time?

But you can have your checking (and parsing btw) done at C-T using static:
static myRegex = regex(`(?>test)`, "i"); 

In the above myRegex will be precompiled at CTFE. No spedcial native code
generated unlike ctRegex, but no parsing at runtime. If need be you can create
static arrays of regex patterns at CTFE and later on assign them to local auto
variables.

So I'm marking this as resolved-invalid as there is nothing that can be done to
make original do CTFE (at the language level), and there is an easy solution
that is explicit and works.

> 
> std.regex.RegexException@/opt/compilers/dmd2/include/std/regex.d(1947):  ':',
> '=', '<', 'P' or '!' expected after '(?' 
> Pattern with error: `(?>` <--HERE-- `test)`
> Pattern with error: `(?>` <--HERE-- `test)`
> ----------------
> /home/d677/f315(ref @trusted std.regex.Parser!(immutable(char)[]).Parser
> std.regex.Parser!(immutable(char)[]).Parser.__ctor!(const(char)[]).__ctor(immutable(char)[],
> const(char)[])+0x98) [0x469978]
> /home/d677/f315(@safe std.regex.Regex!(char).Regex
> std.regex.regexImpl!(immutable(char)[]).regexImpl(immutable(char)[],
> const(char)[])+0x5a) [0x453bca]
> /home/d677/f315(std.regex.Regex!(char).Regex
> std.functional.memoize!(_D3std5regex18__T9regexImplTAyaZ9regexImplFNfAyaAxaZS3std5regex12__T5RegexTaZ5Regex,
> 8).memoize(immutable(char)[], const(char)[])+0xe5) [0x470a55]
> /home/d677/f315(@trusted std.regex.Regex!(char).Regex
> std.regex.regex!(immutable(char)[]).regex(immutable(char)[],
> const(char)[])+0x41) [0x453b59]
> /home/d677/f315(_Dmain+0x39) [0x4537f9]
> /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
> int function(char[][])*).void runMain()+0x18) [0x47bb4c]
> /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
> int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
> /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
> int function(char[][])*).void runAll()+0x40) [0x47bb9c]
> /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
> int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
> /home/d677/f315(_d_run_main+0x1ae) [0x47b63a]
> /home/d677/f315(main+0x17) [0x47b487]
> /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x40967a15]

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